package com.pet.common.interceptor;

import com.pet.common.domain.UserContext;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class UserInfoInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 1. 获取请求头中的用户信息
        String userInfo = request.getHeader("user-info");
        // 2. 判断是否为空
        if (userInfo != null) {
            Integer userId = Integer.valueOf(userInfo);
            // 不为空, 保存到ThreadLocal
            UserContext.setUser(userId);
        }
        // 3. 放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        // 移除用户
        UserContext.removeUser();
    }
}
